Xojo Plugin

Ibanity HTTP Signature for XS2A, Isabel Connect, Ponto Connect

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Demonstrates how to add a Signature header for Ibanity HTTP requests. Xojo Plugin

Dim success As Boolean
success = False

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// In order to sign your HTTP requests, you have to add 2 headers to the HTTP request: Digest: the digest of the request payload and Signature: the actual signature of the request. 

// POST /xs2a/customer-access-tokens HTTP/1.1
// Host: api.ibanity.com
// Content-Type: application/json
// Digest: SHA-512=z4PhNX7vuL3xVChQ1m2AB9Yg5AULVxXcg/SpIdNs6c5H0NE8XYXysP+DGNKHfuwvY7kxvUdBeoGlODJ6+SfaPg==
// Ibanity-Idempotency-Key: 61f02718-eeee-46e1-b5eb-e8fd6e799c2d
// Signature: keyId="62f02718-eeee-46e1-b5eb-e8fd6e799c2e",created=1599659223,algorithm="hs2019",headers="(request-target) host digest (created) ibanity-idempotency-key",signature="SjWJWbWN7i0...zsbM="
// 
// {"data":{"type":"customerAccessToken", "attributes":{"applicationCustomerReference":"15874569"}}}

// The payload (body) of the above HTTP request is the JSON.
// Build the JSON above.
// Use this online tool to generate code from sample JSON: 
// Generate Code to Create JSON
Dim json As New Chilkat.JsonObject
success = json.UpdateString("data.type","customerAccessToken")
success = json.UpdateString("data.attributes.applicationCustomerReference","15874569")

Dim payload As String
payload = json.Emit()
System.DebugLog("payload = " + payload)

// Step 1: Build the (created) virtual header

Dim dtNow As New Chilkat.CkDateTime
success = dtNow.SetFromCurrentSystemTime()
Dim created As String
created = dtNow.GetAsUnixTimeStr(False)
System.DebugLog("created = " + created)

// Step 2: Build the Digest header
Dim crypt As New Chilkat.Crypt2
crypt.HashAlgorithm = "sha512"
crypt.EncodingMode = "base64"
crypt.Charset = "utf-8"

Dim sbDigestHdrValue As New Chilkat.StringBuilder
success = sbDigestHdrValue.Append("SHA-512=")
success = sbDigestHdrValue.Append(crypt.HashStringENC(json.Emit()))

System.DebugLog(sbDigestHdrValue.GetAsString())

// Step 3: Build the (request target) virtual header

// In order to build the signature you will need a virtual header named (request-target) (the parentheses are important). 
// The (request-target) is the string concatenation of the HTTP method (in lowercase) with the path and query parameters.
Dim request_target As String
request_target = "post /xs2a/customer-access-tokens"

// Step 4: Build the signing string

// The signing string is the concatenation of the signed header names (in lowercase) and values separated by a LF.

// You must always sign the following headers: (request-target), host, (created), digest. 
// If used, you must also sign the authorization header and any ibanity-* headers, such as ibanity-idempotency-key. 

Dim sbSigningString As New Chilkat.StringBuilder
success = sbSigningString.Append("(request-target): ")
success = sbSigningString.AppendLine(request_target,False)
success = sbSigningString.Append("host: ")
success = sbSigningString.AppendLine("api.ibanity.com",False)
success = sbSigningString.Append("digest: ")
success = sbSigningString.AppendLine(sbDigestHdrValue.GetAsString(),False)
success = sbSigningString.Append("(created): ")
success = sbSigningString.AppendLine(created,False)
success = sbSigningString.Append("ibanity-idempotency-key: ")
Dim idempotencyKey As String
idempotencyKey = crypt.GenerateUuid()
success = sbSigningString.Append(idempotencyKey)

// Step 5: Build the signed headers list

// To allow Ibanity to check the signed headers, you must provide a list of the header names. They should be lowercase and in the same order used to create the signing string. 
Dim signed_headers_list As String
signed_headers_list = "(request-target) host digest (created) ibanity-idempotency-key"

// Step 6: Build the Signature header

// This is where the real signing happens. The signature header is a combination of several sub-headers -
// 
//     keyId: the identifier for the application's signature certificate, obtained from the Developer Portal
//     algorithm: the digital signature algorithm used to generate the signature (must be hs2019)
//     headers: The list of HTTP headers created in step 5
//     signature: the Base64-encoded digital signature of the signing string created in step 4.

Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadEncryptedPemFile("my_ibanity_signature_private_key.pem","pem_password")
If (success = False) Then
    System.DebugLog(privKey.LastErrorText)
    Return
End If

Dim rsa As New Chilkat.Rsa
rsa.PssSaltLen = 32
rsa.EncodingMode = "base64"
// Use the RSASSA-PSS signature algorithm
rsa.PkcsPadding = False

success = rsa.UsePrivateKey(privKey)
If (success = False) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

// Sign the signing string.
Dim sigBase64 As String
sigBase64 = rsa.SignStringENC(sbSigningString.GetAsString(),"sha-256")
If (rsa.LastMethodSuccess = False) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

// Build the signature header value.
Dim sbSigHeaderValue As New Chilkat.StringBuilder
success = sbSigHeaderValue.Append("keyId=""")
// Use your identifier for the application's signature certificate, obtained from the Developer Portal
success = sbSigHeaderValue.Append("62f02718-eeee-46e1-b5eb-e8fd6e799c2e")
success = sbSigHeaderValue.Append(""",created=")
success = sbSigHeaderValue.Append(created)
success = sbSigHeaderValue.Append(",algorithm=""hs2019"",headers=""")
success = sbSigHeaderValue.Append(signed_headers_list)
success = sbSigHeaderValue.Append(""",signature=""")
success = sbSigHeaderValue.Append(sigBase64)
success = sbSigHeaderValue.Append("""")

System.DebugLog(sbSigHeaderValue.GetAsString())